Design and Optimization of a Spatial Hybrid Motion System

2010 ◽  
Author(s):  
P. R. Ouyang ◽  
Steven Cargnello
Keyword(s):  
Optimization Design ◽  
Design Principle ◽  
Compliant Mechanism ◽  
Dynamic Performance ◽  
Parallel Architecture ◽  
Element Analysis ◽  
Design And Optimization ◽  
Motion System ◽  
Micro Motion ◽  
Hybrid Motion

In this paper, a spatial hybrid motion system is developed that integrates two types of motions through one compliant mechanism: a macro motion driven by a DC servomotor and a micro motion driven by a PZT actuator. A unique feature of the developed hybrid motion system is the elimination of interaction between the macro motion and micro motion. Three issues are addressed in this study: (1) the design principle and implementation of the hybrid motion system; (2) the kinematic analysis and dynamic analysis; and (3) the optimization design of the hybrid motion system. For the micro motion, the five-bar topology of a mechanical amplifier is used to increase amplifying ratio and improve dynamic performance of the system. Finite element analysis results verify the design principle of the parallel architecture for the hybrid motion system.

Research on Running Stability of the Rail Vehicle Based on SIMPACK

2013 ◽  
Vol 328 ◽  
pp. 589-593
Author(s):  
Li Hua Wang ◽  
An Ning Huang ◽  
Guang Wei Liu
Keyword(s):  
Dynamic Model ◽  
Optimization Design ◽  
Dynamic Performance ◽  
Running Speed ◽  
Design And Optimization ◽  
Rail Vehicle ◽  
Body Dynamics ◽  
Multi Body ◽  
Body Dynamic ◽  
Track Irregularities

There are higher requirements on running stability of the rail vehicle with the incensement of the running speed. The running stability is one of the important indicators of evaluating the dynamic performance of the rail vehicle. In this paper, the whole multi-body dynamic model of the rail vehicle was proposed based on the theory of multi-body dynamics in the software of Simpack. And the lateral and vertical vibrate accelerations of the rail vehicle were simulated when it was inspired by the track irregularities. Then the running stabilities of the rail vehicle were estimated accurately. This will propose basis on the improving design and optimization design of the whole rail vehicle.

An Improved Unified Solution for a Vibration Equation of Tension-Stiffening Beam Using Extended Rayleigh Energy Method

2019 ◽  
Author(s):  
Zhijun Yang ◽  
Ruiqi Li ◽  
Youdun Bai
Keyword(s):  
Boundary Conditions ◽  
Analytical Solutions ◽  
Energy Method ◽  
Physical Science ◽  
Element Analysis ◽  
Tension Stiffening ◽  
Design And Optimization ◽  
Micro Motion ◽  
Stiffening Effect ◽  
Good Agreement

Abstract The tension-stiffening effect is very important for physical science, which has been widely used in MEMS, sensors and micro-motion stages. The analytical solutions of the tension-stiffening beam are extremely significant, in consideration of the inefficiency of finite element analysis (FEA) for the design and optimization. Commonly, there are three typical types of boundary conditions for tension-stiffening (or stress-induced) beams, i.e., clamped-clamped, clamped-hinged, and hinged-hinged. But only the hinged-hinged beam has an analytical solution. Therefore, a method based on extended Rayleigh energy method is proposed in this paper to deduce the analytical solutions of three boundary conditions. The predictions are verified to be in good agreement with FEA and experiment results.

scholarly journals Design and optimization of main reducer based on Baja racing

2021 ◽  
Vol 260 ◽  
pp. 03015
Author(s):  
Taiyu Ning ◽  
Chao He ◽  
Jifei Chen ◽  
Xueyuan Liu ◽  
Wengang Chen ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
High Reliability ◽  
Dynamic Performance ◽  
3D Models ◽  
Transmission Ratio ◽  
Main Function ◽  
Element Analysis ◽  
Ratio Distribution ◽  
Design And Optimization ◽  
Main Component

The main reducer is the main component of the whole vehicle, and its main function is to realize deceleration and torque increase. For Baha racing car, in order to improve the dynamic performance of the whole car, the main reducer is designed from the aspects of layout, transmission ratio distribution, shift mode, overall size and shell structure. Calculate the transmission ratio range of reducer according to the performance parameters of transmission parts, and verify the rationality of transmission ratio; Then determine the parameters of gear according to the transmission ratio and related parameters, and finally design the parameters of gear according to the transmission ratio and related parameters, and finally design the parameters of other parts of reducer. Based on the determined parameters, 3D modeling software UG is used to build 3D models of various parts of the reducer, and finite element analysis software ANSYS is used to simulate and analyze the parts to check whether the comprehensive mechanical properties meet the requirements. In this paper, the design of the main reducer realizes the comprehensive design of small size, light weight, reasonable transmission ratio distribution, high reliability, shifting gears during driving, and the comprehensive mechanical properties also meet the requirements.

scholarly journals Design of Four-DoF Compliant Parallel Manipulators Considering Maximum Kinematic Decoupling for Fast Steering Mirrors

Actuators ◽  
2021 ◽  
Vol 10 (11) ◽  
pp. 292
Author(s):  
Guangbo Hao ◽  
Haiyang Li ◽  
Yu-Hao Chang ◽  
Chien-Sheng Liu
Keyword(s):  
Degrees Of Freedom ◽  
Compliant Mechanism ◽  
Parallel Manipulators ◽  
Laser Beams ◽  
Element Analysis ◽  
Compliance Matrix ◽  
Precision Control ◽  
Motion System ◽  
Matrix Modelling

Laser beams can fluctuate in four directions, which requires active compensation by a fast steering mirror (FSM) motion system. This paper deals with the design of four-degrees-of-freedom (DoF) compliant parallel manipulators, for responding to the requirements of the FSM. In order to simplify high-precision control in parallel manipulators, maximum kinematic decoupling is always desired. A constraint map method is used to propose the four required DoF with the consideration of maximum kinematic decoupling. A specific compliant mechanism is presented based on the constraint map, and its kinematics is estimated analytically. Finite element analysis demonstrates the desired qualitative motion and provides some initial quantitative analysis. A normalization-based compliance matrix is finally derived to verify and demonstrate the mobility of the system clearly. In a case study, the results of normalization-based compliance matrix modelling show that the diagonal entries corresponding to the four DoF directions are about 10 times larger than those corresponding to the two-constraint directions, validating the desired mobility.

Design and Optimization of Multiple Single-DOF Tuned Mass Dampers Based on Flexure Design Theory

2018 ◽  
Author(s):  
Wenshuo Ma ◽  
Yiqing Yang ◽  
Jingjun Yu
Keyword(s):  
Design Theory ◽  
Dynamic Performance ◽  
Maximum Amplitude ◽  
Single Mode ◽  
Primary System ◽  
Tuned Mass Dampers ◽  
Precision Engineering ◽  
Element Analysis ◽  
Design And Optimization ◽  
Stiffness And Damping

Vibration is an undesirable phenomenon in engineering, and its avoidance has received considerable attention, especially for the cases of precision engineering. Since the dynamic performance of precision mechanisms are most likely to be restricted by their 1st modes, multiple single degree of freedom (SDOF) tuned mass dampers (TMDs) are designed to suppress a translational moving platform with single mode. The TMDs are designed with optimal stiffness and damping ratios, which are acquired by numerical optimization using minimax algorithm. Each SDOF TMD is implemented via the graphical approach and modeled by substructure dynamic modeling techniques. Results of finite element analysis (FEA) show that the maximum amplitude of frequency response function (FRF) of the primary system can be damped to 89.14% when N is 3, which validates the vibration mitigation by employing the designed TMDs. Furthermore, the proposed design routine provides a guidance for implementation of multiple SDOF TMDs.

Vibration characteristics of island-bridge structure on porous PDMS substrates for stretchable electronics

2021 ◽  
pp. 1-18
Author(s):  
Xin Song ◽  
Zuguang Bian ◽  
Xiaoliang Zhou ◽  
Zhuye Huang
Keyword(s):  
Analytical Model ◽  
Mechanical Design ◽  
Dynamic Performance ◽  
Structure Design ◽  
Vibration Characteristics ◽  
Mode Shapes ◽  
Stretchable Electronics ◽  
Bridge Structure ◽  
Element Analysis ◽  
Design And Optimization

Abstract Stretchable electronics employing island-bridge structure design can achieve controllable and reversible stretchability. The use of a porous substrate, which provides excellent breathability for wearable devices bonded to skin, not only satisfies this static superiority but also has a profound impact on the dynamic performance of the stretchable electronics. In this paper, the vibration characteristics of the island-bridge structure based on porous polydimethylsiloxane (p-PDMS) substrates are studied by utilizing an analytical model, which takes account of geometric nonlinearity due to mid-plane stretching, buckling configuration, elastic boundary conditions considering the p-PDMS substrates and the mass of the island. In numerical examples, the accuracy of the analytical model is first verified by finite element analysis (FEA). After that, we investigate the effects of some primary factors, i.e. the prestrain of the substrate, spring stiffnesses at the ends of the interconnect, porosity and thickness of the substrate, and the mass of the island, on the natural frequencies and vibration mode shapes of the island-bridge structure. Results show that the vibration characteristics of the island-bridge structure can be tuned conveniently by adjusting the porosity of the substrate and the mass of the island, which are expected to be helpful to mechanical design and optimization of stretchable electronics in complex noise environments.

Optimal Design and Test of Ultrasonic Vibration System

2012 ◽  
Vol 226-228 ◽  
pp. 21-25 ◽  
Author(s):  
Xin Lei Miao ◽  
Yong Wei Zhu
Keyword(s):  
Finite Element ◽  
Ultrasonic Vibration ◽  
Optimization Design ◽  
Natural Vibration ◽  
Dynamic Performance ◽  
Vibration System ◽  
Element Analysis ◽  
The Finite Element Analysis ◽  
Analysis Package ◽  
Structure Dimension

Ultrasonic vibration system is the chief component of USM machine tool. Whether products are precisely machined is lie on the performance of the system. To design good performance of ultrasonic vibration system, finite element method is used to analyse the dynamic performance of the system based on theoretic calculation. The dynamic performance of transformer and transformer with tool is analysed respectively, including natural vibration characteristic and harmonic characteristic. The result of FEA is compared with theoretic calculation. The parametric optimization design technique of the finite element analysis package ANSYS is applied to optimize the structure dimension of the piezoelectric transducer and transformer with tool. Then amplitude of the optimized system and the previous system is compared based on laser-CCD sensor for micro-displacement. The optimized system is more superior and has larger amplitude. Last some round holes are machined on kentanium YG8, monocrystalline silicon, PZT. And machining effect of single Micro-USM is got by the test.

The Design and Analysis on 200 Liters Large Material Barrels with Double L-Rings

2013 ◽  
Vol 805-806 ◽  
pp. 1712-1715
Author(s):  
De Qiang Zhang ◽  
Yu Li ◽  
Jin Hua Li
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Optimization Design ◽  
Theoretical Calculations ◽  
Three Dimensional ◽  
Three Dimensional Model ◽  
Element Analysis ◽  
Design And Optimization ◽  
Stress Optimization ◽  
Large Material

Structural design and optimization of 200 liters large material barrels with Double L-ring are studied, Stacking stress analysis and optimization analysis in SolidWorks Simulation Finite Element Analysis plug-in three-dimensional model of the material barrel, Plug-in of Finite Element Analysis SolidWorks simulation is used to get the result of analysis for stacking stress, optimization and dropping test. Stress contours, strain contours, the stress data of optimization are obtained by function of static analysis and optimization. The result of analysis is very close to the results of the theoretical calculations. It shows that the optimization design to improve product quality and efficiency has a very important theoretical and practical value.

Structure Sensitivity Analysis and Dynamic Performance Optimization of Marine Gearbox

2017 ◽  
Author(s):  
Tengjiao Lin ◽  
Daokun Xie ◽  
Ziran Tan ◽  
Bo Liu
Keyword(s):  
Sensitivity Analysis ◽  
Performance Optimization ◽  
Optimization Design ◽  
Dynamic Performance ◽  
Structure Sensitivity ◽  
Superposition Method ◽  
Structure Parameters ◽  
Analysis Model ◽  
Vibration Acceleration ◽  
Response Optimization

The aim of this paper is to investigate the influence of structure parameters on the vibration characteristics and improve the dynamic performance of marine gearbox. A finite element model was established to solve the dynamic response by using modal superposition method. Based on the theory of multi-objective optimization design, the structure sensitivity analysis model of marine gearbox was established, which takes the structure parameters of the housing as design variables. The modal and response sensitivity was obtained by using the optimal gradient method. According to the results of sensitivity analysis, a modal and response optimization model of marine gearbox was established. The objective was to avoid natural frequencies from the excitation frequencies and minimize the root mean square of vibration acceleration of the evaluating points on the surface of housing. Then the modal optimization and response optimization of gearbox were carried out by using zero-order and first-order optimization method. The results indicate that the dynamic optimization of the gearbox can be achieved. After optimization, the amplitude of vibration acceleration of the evaluating points on the housing surface has been reduced and the resonance of marine gearbox can be avoided.

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